Which one of the following is not true regarding electromeric eff

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 Multiple Choice QuestionsMultiple Choice Questions

281.

The C-H bond and C-C bond in ethane are formed by which of the following types of overlap?

  • sp2-s and sp2-sp2

  • sp-s and sp-sp

  • p-s and p-p

  • sp3-s and sp3-sp3


282.

Which one of the following has a magnetic moment of.1.75 BM?

  • V3+

  • Cr3+

  • Fe3+

  • Ti3+


283.

Which one of the following contains ionic, covalent and coordinate bonds?

  • NaCl

  • NaCN

  • NaNC

  • NaOH


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284.

Which one of the following is not true regarding electromeric effect?

  • It is a temporary effect

  • It operates on multiple bonds

  • It requires an attacking reagent

  • It results in the appearance of partial charges on the carbon atoms


D.

It results in the appearance of partial charges on the carbon atoms

In electromeric effect, there is complete transfer of π-electrons from one atom to other to produce temporary polarity on atoms joined by multiple bonds.

Therefore, there is no required partial charge on substrate (i.e., C-atoms).


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285.

d2sp3 hybridisation of the atomic orbitals gives

  • square planar structure

  • triangular structure

  • tetrahedral structure

  • octahedral structure


286.

A group of atoms can function as a ligand only when

  • It is a small molecule

  • It has an unshared electron pair

  • Its a negatively charged ion

  • It is a positively charge ion


287.

Which of the following is diamagnetic?

  • H2+

  • He2+

  • O2

  • N2


288.

The number of anti-boinding electron present in O2+ molecular ion is

  • 8

  • 6

  • 5

  • 4


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289.

The pair of compounds having identical shapes for their molecules is

  • CH4, SF4

  • BCl3, ClF3

  • XeF2, ZnCl2

  • SO2, CO2


290.

The correct arrangement for the ions in the increasing order of their radii is

  • Na+, Cl-, Ca2+

  • Ca2+, K+, S2-

  • Na+, Al3+, Be2+

  • Cl-, F-, S2-


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